Chemistry Revision Questions No.1

Level 2

(In examinations you will be provided with a copy of the Periodic table. This may however have some missing elements in the first 20, which you will have to fill in!)
  1. Liquids diffuse slower than gases because liquid molecules are:

    2. a) More compressible than gas molecules

    b) Heavier than gas molecules

    c) Less free to move than gas molecules

  2. Mixtures differ from compounds in:

    3. a) Only being solids

    b) Being able to be separated by physical means

    c) Containing two elements

  3. Heating a solid:

    4. a) Causes the molecules to move further apart

    b) Always causes the molecules to fuse closer

    c) Vaporises the molecules

  4. How many atoms are there in a molecule of nitric acid HNO3?

    5. a) 3

    b) 1

    c) 5

  5. How many atoms are there in a molecule of normal atmospheric oxygen?

    6. a) 1

    b) 2

    c) 8

  6. Which element has 16 protons?

    7. a) Sulphur

    b) Diatomic oxygen

    c) Oxygen

  7. The Periodic Table is arranged in such a way that what is to the left of the zig-zag line?

    8. .......................................................

  8. Name the first three elements in the third period of the Periodic Table.

    9. .......................................................

  9. Which is the least reactive(ie most stable) Group in the Table?
  10. Write the symbol for a calcium ion.
  11. Are chloride ions cations or anions?
  12. Hydrogen and which type of elements have positive ions?
  13. Which is the most stable, a Group 2 Period 2 element with 2 outer electrons or a Group 0 Period 1 element with 2 outer electrons?

 

 

 

 

 

 

 

 

Answers: (1 mark for each correct answer)
  1. (c) - recall the liquid molecules are closer together and cannot move far without colliding with other liquid molecules.
  2. (b) - this question is an absolute steal!
  3. (a)
  4. (c).. 1 hydrogen, 1 nitrogen, 3 oxygens
  5. (b) atmospheric oxygen normally occurs as diatoic molecules of O2
  6. (a)
  7. Metals
  8. Sodium Na, Magnesium Mg, Aluminium Al. (Remember periods are the horizontals(rows)
  9. Group 0- the Noble Gases. This is because they have full outer shells.
  10. Ca2+
  11. Chloride forms Cl- ions - aNions (N for negative)
  12. Metals
  13. The Group 0 Period 1 (He). 2 outers are stable in the first shell-after that the most stable shell configuration for our purposes is 8 outer electrons.

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